CN108353407B - Techniques for managing cell identifiers and other parameters for flexible duplex operation - Google Patents

Techniques for managing cell identifiers and other parameters for flexible duplex operation Download PDF

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CN108353407B
CN108353407B CN201680063721.4A CN201680063721A CN108353407B CN 108353407 B CN108353407 B CN 108353407B CN 201680063721 A CN201680063721 A CN 201680063721A CN 108353407 B CN108353407 B CN 108353407B
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radio frequency
frequency spectrum
cell
spectrum band
downlink transmission
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CN108353407A (en
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陈万士
P·加尔
N·王
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Qualcomm Inc
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Qualcomm Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections

Abstract

Techniques for wireless communication at a User Equipment (UE) are described. A method includes determining a first cell Identifier (ID) associated with a first downlink transmission in a first radio frequency spectrum band of a pair of radio frequency spectrum bands, determining a second cell ID associated with a second downlink transmission in a second radio frequency spectrum band of the pair of radio frequency spectrum bands; and communicating based on the first cell ID and the second cell ID. In some cases, the method may include determining a cell ID associated with a downlink transmission in an uplink radio frequency spectrum band, and receiving the downlink transmission in a subframe of the uplink radio frequency spectrum band. The downlink transmission may be based on a cell ID and a format of a Physical Uplink Shared Channel (PUSCH), and may include eight layers of single user multiple input multiple output (SU-MIMO) transmission.

Description

Techniques for managing cell identifiers and other parameters for flexible duplex operation
Cross-referencing
This patent application claims priority from PCT patent application No. PCT/CN2015/093594 entitled "Techniques for manufacturing cell Identifiers and Other Parameters for Flexible Duplex Operations" filed on day 11, 2, 2005 by Chen et al, assigned to the assignee of the present application and hereby incorporated by reference in its entirety.
Technical Field
For example, the present disclosure relates to wireless communication systems, and in particular, to techniques for managing cell identifiers and other parameters for flexible duplex operation.
Background
Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, and Orthogonal Frequency Division Multiple Access (OFDMA) systems.
As an example, a wireless multiple-access communication system may include multiple base stations, each supporting communication for multiple communication devices (also referred to as User Equipments (UEs)) simultaneously. A base station may communicate with a UE using a downlink radio frequency spectrum band (e.g., for transmissions from the base station to the UE) and an uplink radio frequency spectrum band (e.g., for transmissions from the UE to the base station). In some cases, the downlink bandwidth or uplink bandwidth may be over-utilized or under-utilized.
Disclosure of Invention
For example, the present disclosure relates to techniques for managing cell identifiers and other parameters for flexible duplex operation. In the event that the downlink radio frequency spectrum band is paired with the uplink radio frequency spectrum band and the downlink radio frequency spectrum band is over-utilized, the uplink radio frequency spectrum band is under-utilized or the interference characteristics associated with the uplink radio frequency spectrum band are different than the interference characteristics associated with the downlink radio frequency spectrum band, the uplink radio frequency spectrum band may be dynamically used for downlink transmissions. In these cases, a cell Identifier (ID), a quasi-co-location (QCL) configuration, a rate matching configuration, and other parameters or information may be separately managed for a first downlink transmission in a downlink radio frequency spectrum band and a second downlink transmission in an uplink radio frequency spectrum band.
A method for wireless communication at a UE is described. The method can comprise the following steps: the method may include determining a first cell Identifier (ID) associated with a first downlink transmission in a first radio frequency spectrum band of a pair of radio frequency spectrum bands, determining a second cell ID associated with a second downlink transmission in a second radio frequency spectrum band of the pair of radio frequency spectrum bands, and communicating based at least in part on the first cell ID and the second cell ID.
In some examples of the method, the first band of radio frequency spectrum may comprise a downlink band of radio frequency spectrum and the second band of radio frequency spectrum may comprise an uplink band of radio frequency spectrum. In some examples, the method may also include determining a second QCL configuration for a second downlink transmission. In some examples, the second QCL configuration may be determined based at least in part on the first QCL configuration. In some examples, the second QCL configuration may include at least a first reference signal received in a downlink radio frequency spectrum band and at least a second reference signal received in an uplink radio frequency spectrum band.
In some examples, the at least first reference signal may include at least one of a cell-specific reference signal (CRS) or a channel state information reference signal (CSI-RS), and the at least second reference signal may include at least one of a demodulation reference signal (DM-RS) or a Sounding Reference Signal (SRS). In some examples, the method may further comprise: a second rate matching configuration for a second downlink transmission is determined. In some examples, the method may further include determining a first rate matching configuration for the first downlink transmission, and may determine a second rate matching configuration based at least in part on the first rate matching configuration. In some examples, the second rate matching configuration may include at least one of: non-CRS related rate matching, or second CRS related rate matching associated with a sparser CRS compared to first CRS related rate matching associated with a first downlink transmission, or third CRS related rate matching associated with a dynamically occurring CRS, or non-control region related rate matching compared to control region related rate matching associated with a first downlink transmission, or a combination thereof.
In some examples, the first cell ID may be different from the second cell ID, and communicating may include: a first CRS associated with a first cell ID is received in a downlink radio frequency spectrum band and a second CRS associated with a second cell ID is received in an uplink radio frequency spectrum band. In some examples, the first cell ID and the second cell ID may include the same cell ID, and communicating may include receiving a first CRS associated with the first cell ID in a downlink radio frequency spectrum band and receiving a second CRS associated with the second cell ID in an uplink radio frequency spectrum band. In some examples, the method may further comprise: determining first Channel State Information (CSI) feedback for a first downlink transmission; and determining second CSI feedback for the second downlink transmission.
In some examples, the method may further comprise: the CSI-RS is received in a downlink radio frequency spectrum band and the SRS is received in an uplink radio frequency spectrum band. The first CSI feedback may be based at least in part on the CSI-RS, and the second CSI feedback may be based at least in part on the SRS. In some examples, communicating may include receiving a DRS. In some examples, the DRS may include at least a first reference signal received in a downlink radio frequency spectrum band and at least a second reference signal received in an uplink radio frequency spectrum band.
In some examples, the at least first reference signal may include at least one of a Primary Synchronization Signal (PSS) or a Secondary Synchronization Signal (SSS) or a CRS, and the at least second reference signal may include at least one of a CSI-RS or an SRS. In some examples, the first and second radio frequency spectrum bands may be associated with at least one of: different transmit power limits or different interference characteristics or a combination thereof. In some examples, the first cell ID and the second cell ID may include the same physical cell ID (pci) or the same virtual cell ID (vci).
In some examples, the method may further comprise: receiving a second downlink transmission in a subframe of a second radio frequency spectrum band, the second downlink transmission based at least in part on a second cell ID and a format of a Physical Uplink Shared Channel (PUSCH), and the second downlink transmission comprising an eight layer single user multiple input multiple output (SU-MIMO) transmission. In some examples, the second downlink transmission is associated with at least one of: eight different cyclic shifts in each of a first slot and a second slot of a subframe, or a first four different sets of cyclic shifts in the first slot and a second four different sets of cyclic shifts in the second slot, or a first four different sets of cyclic shifts in the first frequency comb and a second four different sets of cyclic shifts in the second frequency comb, or a combination thereof.
In one example, an apparatus for wireless communication at a UE is described. The apparatus may include: the apparatus generally includes means for determining a first cell ID associated with a first downlink transmission in a first radio frequency spectrum band of a pair of radio frequency spectrum bands, means for determining a second cell ID associated with a second downlink transmission in a second radio frequency spectrum band of the pair of radio frequency spectrum bands, and means for communicating based at least in part on the first cell ID and the second cell ID.
In some examples of the apparatus, the first band of radio frequency spectrum may comprise a downlink band of radio frequency spectrum and the second band of radio frequency spectrum may comprise an uplink band of radio frequency spectrum. In some examples, the apparatus may also include means for determining a second QCL configuration for a second downlink transmission. In some examples, the apparatus may also include means for determining a first QCL configuration for the first downlink transmission, and the second QCL configuration may be determined based at least in part on the first QCL configuration. In some examples, the second QCL configuration may include at least a first reference signal received in a downlink radio frequency spectrum band and at least a second reference signal received in an uplink radio frequency spectrum band.
In some examples, the at least first reference signal may include at least one of a CRS or a CSI-RS, and the at least second reference signal may include at least one of a DM-RS or an SRS. In some examples, the apparatus may also include means for determining a second rate matching configuration for a second downlink transmission. In some examples, the apparatus may also include means for determining a first rate-matching configuration for the first downlink transmission, and may determine a second rate-matching configuration based at least in part on the first rate-matching configuration. In some examples, the second rate matching configuration may include at least one of: non-CRS related rate matching, or second CRS related rate matching associated with a sparser CRS compared to first CRS related rate matching associated with a first downlink transmission, or third CRS related rate matching associated with a dynamically occurring CRS, or non-control region related rate matching compared to control region related rate matching associated with a first downlink transmission, or a combination thereof.
In some examples, the first cell ID may be different from the second cell ID, and the means for communicating may include means for receiving a first CRS associated with the first cell ID in a downlink radio frequency spectrum band and means for receiving a second CRS associated with the second cell ID in an uplink radio frequency spectrum band. In some examples, the first cell ID and the second cell ID may include a same cell ID, and the means for communicating may include means for receiving a first CRS associated with the first cell ID in a downlink radio frequency spectrum band and means for receiving a second CRS associated with the second cell ID in an uplink radio frequency spectrum band.
In some examples, the apparatus may also include means for determining first CSI feedback for the first downlink transmission; and means for determining second CSI feedback for a second downlink transmission. In some examples, the apparatus may also include means for receiving the CSI-RS in a downlink radio frequency spectrum band, and means for receiving the SRS in an uplink radio frequency spectrum band. The first CSI feedback may be based at least in part on the CSI-RS, and the second CSI feedback may be based at least in part on the SRS.
In some examples, the means for communicating may include means for receiving a DRS. In some examples, the DRS may include at least a first reference signal received in a downlink radio frequency spectrum band and at least a second reference signal received in an uplink radio frequency spectrum band. In some examples, the at least first reference signal may include at least one of a PSS or a SSS or a CRS, and the at least second reference signal may include at least one of a CSI-RS or a SRS. In some examples, the first and second radio frequency spectrum bands may be associated with at least one of: different transmit power limits, or different interference characteristics, or a combination thereof. In some examples, the first cell ID and the second cell ID may include the same PCI or the same VCI.
In some examples, the apparatus may also include means for receiving a second downlink transmission in a subframe of a second radio frequency spectrum band, the second downlink transmission based at least in part on a second cell ID and a format of a Physical Uplink Shared Channel (PUSCH), and the second downlink transmission comprising an eight layer single user multiple input multiple output (SU-MIMO) transmission. In some examples, the second downlink transmission is associated with at least one of: eight different cyclic shifts in each of a first slot and a second slot of a subframe, or a first four different sets of cyclic shifts in the first slot and a second four different sets of cyclic shifts in the second slot, or a first four different sets of cyclic shifts in the first frequency comb and a second four different sets of cyclic shifts in the second frequency comb, or a combination thereof.
In one example, an apparatus for wireless communication at a UE may include a processor and a memory in electronic communication with the processor. The processor and memory may be configured to determine a first cell ID associated with a first downlink transmission in a first radio frequency spectrum band of a pair of radio frequency spectrum bands, determine a second cell ID associated with a second downlink transmission in a second radio frequency spectrum band of the pair of radio frequency spectrum bands, and communicate based at least in part on the first cell ID and the second cell ID.
In some examples, the first radio frequency spectrum band may comprise a downlink radio frequency spectrum band and the second radio frequency spectrum band may comprise an uplink radio frequency spectrum band. In some examples, the processor and memory may be further configured to determine a second QCL configuration for a second downlink transmission. In some examples, the second QCL configuration may include at least a first reference signal received in a downlink radio frequency spectrum band and at least a second reference signal received in an uplink radio frequency spectrum band. In some examples, the processor and memory may be further configured to determine a second rate matching configuration for a second downlink transmission. In some examples, the second rate matching configuration may include at least one of: non-CRS related rate matching, or second CRS related rate matching associated with a sparser CRS compared to first CRS related rate matching associated with a first downlink transmission, or third CRS related rate matching associated with a dynamically occurring CRS, or non-control region related rate matching compared to control region related rate matching associated with a first downlink transmission, or a combination thereof.
In some examples, the first cell ID may be different from the second cell ID, and communicating may include receiving a first CRS associated with the first cell ID in a downlink radio frequency spectrum band and receiving a second CRS associated with the second cell ID in an uplink radio frequency spectrum band. In some examples, the first cell ID and the second cell ID may include the same cell ID, and communicating may include receiving a first CRS associated with the first cell ID in a downlink radio frequency spectrum band and receiving a second CRS associated with the second cell ID in an uplink radio frequency spectrum band. In some examples, the processor and the memory may be further configured to: determining first CSI feedback for a first downlink transmission; and determining second CSI feedback for the second downlink transmission. In some examples, communicating may include receiving a DRS. In some examples, the DRS may include at least a first reference signal received in a downlink radio frequency spectrum band and at least a second reference signal received in an uplink radio frequency spectrum band.
In one example, a non-transitory computer-readable medium storing computer executable code for wireless communication is described. The code may be executable by a processor to determine a first cell ID associated with a first downlink transmission in a first radio frequency spectrum band of a pair of radio frequency spectrum bands, determine a second cell ID associated with a second downlink transmission in a second radio frequency spectrum band of the pair of radio frequency spectrum bands, and communicate based at least in part on the first cell ID and the second cell ID.
In some examples of the non-transitory computer-readable medium, the first band of radio frequency spectrum may include a downlink band of radio frequency spectrum and the second band of radio frequency spectrum may include an uplink band of radio frequency spectrum. In some examples, the code may also be executable by the processor to determine a second QCL configuration for a second downlink transmission. In some examples, the second QCL configuration may include at least a first reference signal received in a downlink radio frequency spectrum band and at least a second reference signal received in an uplink radio frequency spectrum band.
In some examples, the code may also be executable by the processor to determine a second rate matching configuration for a second downlink transmission. In some examples, the second rate matching configuration may include at least one of: non-CRS related rate matching, or second CRS related rate matching associated with a sparser CRS compared to first CRS related rate matching associated with a first downlink transmission, or third CRS related rate matching associated with a dynamically occurring CRS, or non-control region related rate matching compared to control region related rate matching associated with a first downlink transmission, or a combination thereof.
The foregoing has outlined rather broadly the techniques and technical advantages according to an example of the present disclosure in order that the detailed description that follows may be better understood. Other techniques and advantages will be described below. The conception and specific examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features of the concepts disclosed herein, their organization and method of operation, and related advantages will be better understood from the following description when considered in connection with the accompanying figures. Each of the figures is provided for the purpose of illustration and description and is not intended as a definition of the limits of the claims.
Drawings
A further understanding of the nature and advantages of the present disclosure may be realized by reference to the following drawings. In the drawings, similar components or functions may have the same reference numerals. Further, multiple components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If only the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label.
Fig. 1 illustrates an example of a wireless communication system in accordance with various aspects of the present disclosure;
fig. 2 illustrates multiple Time Domain Duplex (TDD) uplink-downlink configurations for a radio frame, in accordance with various aspects of the present disclosure;
fig. 3 illustrates an example of a coordinated multipoint (CoMP) transmission scheme in accordance with various aspects of the present disclosure;
fig. 4 illustrates a block diagram of an apparatus for wireless communication in accordance with various aspects of the present disclosure;
fig. 5 illustrates a block diagram of an apparatus for wireless communication in accordance with various aspects of the present disclosure;
fig. 6 illustrates a block diagram of an apparatus for wireless communication in accordance with various aspects of the present disclosure;
fig. 7 illustrates a block diagram of a UE for wireless communication in accordance with various aspects of the present disclosure;
fig. 8 is a flow diagram illustrating an example of a method for wireless communication in accordance with various aspects of the present disclosure;
fig. 9 is a flow diagram illustrating an example of a method for wireless communication in accordance with various aspects of the present disclosure; and
fig. 10 is a flow diagram illustrating an example of a method for wireless communication in accordance with various aspects of the present disclosure.
Detailed Description
Techniques are described that may manage a cell identifier, a quasi-co-location configuration, a rate matching configuration, and other parameters or information separately for a first downlink transmission in a downlink radio frequency spectrum band and a second downlink transmission in an uplink radio frequency spectrum band. The downlink radio frequency spectrum band may be paired with the uplink radio frequency spectrum band, and in some examples, the downlink radio frequency spectrum band and the uplink radio frequency spectrum band may be paired for Frequency Domain Duplex (FDD) operation.
The following description provides examples, and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the described methods may be performed in an order different than that described, and various steps may be added, omitted, or combined. Moreover, features and techniques described with respect to some examples may be combined in other examples.
Fig. 1 illustrates an example of a wireless communication system 100 in accordance with various aspects of the present disclosure. The wireless communication system 100 may include base stations 105, UEs 115, and a core network 130. The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The base station 105 may interface with the core network 130 over a backhaul link 132 (e.g., S1, etc.) and may perform wireless configuration and scheduling for communication with the UE115 or may operate under the control of a base station controller (not shown). In various examples, the base stations 105 may communicate with each other directly or indirectly (e.g., through the core network 130) over a backhaul link 134 (e.g., X2, etc.) that may be a wired or wireless communication link.
The base station 105 may communicate wirelessly with the UE115 via one or more base station antennas. Each base station 105 station may provide communication coverage for a respective geographic coverage area 110. In some examples, the base station 105 may be referred to as a base station transceiver, a wireless base station, an access point, a wireless transceiver, a node B, an evolved node B (enb), a home node B, a home evolved node B, or some other suitable terminology. The geographic coverage area 110 of a base station 105 can be divided into sectors (not shown) that form a portion of the coverage area. The wireless communication system 100 may include different types of base stations 105 (e.g., macro cell base stations or small cell base stations). For different technologies, there may be overlapping geographic coverage areas 110.
In some examples, the wireless communication system 100 may include a Long Term Evolution (LTE)/LTE-advanced (LTE-a) network or a next generation network (e.g., a 5G network). In an LTE/LTE-a network, the term evolved node b (enb) may be used to describe the base station 105, while the term UE may be used to describe the UE 115. The wireless communication system 100 may be a heterogeneous network in which different types of enbs provide coverage for various geographic areas. For example, each eNB or base station 105 may provide communication coverage for a macro cell, a small cell, or other type of cell. The term "cell" is a 3GPP term that can be used to describe a base station, a carrier or component carrier associated with a base station, or a coverage area (e.g., sector, etc.) of a carrier or base station, depending on the context.
A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider. A small cell may be a lower power base station than a macro cell, and may operate in the same or different (e.g., licensed, shared, etc.) radio frequency spectrum band as the macro cell. According to various examples, the small cells may include pico cells, femto cells, and micro cells. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider. A femto cell may also cover a relatively small geographic area (e.g., a home) and may provide restricted access for UEs having association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG), UEs for users in the home, etc.). The eNB for the macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, pico eNB, femto eNB, or home eNB. An eNB may support one or more (e.g., two, three, four, etc.) cells (e.g., component carriers).
The wireless communication system 100 may support synchronous operation or asynchronous operation. For synchronous operation, the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, the base stations may have different frame timings, and transmissions from different base stations may not be aligned in time. The techniques described herein may be used for synchronous operations or asynchronous operations.
A communication network that may accommodate some of the various examples disclosed may be a packet-based network operating according to a layered protocol stack. In the user plane, communications at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based. The Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate on logical channels. A Medium Access Control (MAC) layer may perform priority processing and multiplexing of logical channels to transport channels. The MAC layer may also use hybrid automatic repeat request (HARQ) to provide retransmissions at the MAC layer to improve link efficiency. In the control plane, a Radio Resource Control (RRC) protocol layer may provide for the establishment, configuration, and maintenance of RRC connections between the UE115 and the base station 105 or core network 130 of radio bearers supporting user plane data. At the Physical (PHY) layer, transport channels may be mapped to physical channels.
The UEs 115 may be dispersed throughout the wireless communication system 100, and each UE115 may be fixed or mobile. The UE115 may also include or be referred to by those skilled in the art as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology. The UE115 may be a cellular telephone, a Personal Digital Assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet, a laptop, a cordless telephone, a Wireless Local Loop (WLL) station, or the like. The UE can communicate with various types of base stations and network devices, including macro enbs, small cell enbs, relay base stations, and the like.
The wireless communication links 125 shown in the wireless communication system 100 may include downlink transmissions from the base station 105 to the UE115 or uplink transmissions from the UE115 to the base station 105. Downlink transmissions may also be referred to as forward link transmissions, and uplink transmissions may also be referred to as reverse link transmissions.
In some examples, each communication link 125 may include one or more carriers, where each carrier may be a signal composed of multiple subcarriers (e.g., waveform signals of different frequencies) modulated according to the various wireless technologies described above. Each modulated signal may be transmitted on a different subcarrier and may carry control information (e.g., reference signals, control channels, etc.), overhead information, user data, and so on. The wireless communication link 125 may transmit bi-directional communications using FDD operation (e.g., using paired radio frequency spectrum resources) or Time Domain Duplex (TDD) operation (e.g., using unpaired radio frequency spectrum resources). A frame structure (e.g., frame structure type 1) may be defined for FDD operation and a frame structure (e.g., frame structure type 2) may be defined for TDD operation.
In some examples of the wireless communication system 100, the base station 105 or the UE115 may include multiple antennas to employ an antenna diversity scheme to improve the quality and reliability of communications between the base station 105 and the UE 115. Additionally or alternatively, the base station 105 or UE115 may employ multiple-input multiple-output (MIMO) techniques, which may utilize a multipath environment to transmit multiple spatial layers carrying the same or different encoded data.
The wireless communication system 100 may support operation over multiple cells or carriers, a feature that may be referred to as Carrier Aggregation (CA) or dual connectivity operation. The carriers may also be referred to as Component Carriers (CCs), layers, channels, and the like. The terms "carrier," "component carrier," "cell," and "channel" may be used interchangeably herein. Carrier aggregation may be used with FDD and TDD component carriers.
In a network, a UE115 may be configured to communicate using up to five CCs when operating in carrier aggregation mode or dual connectivity mode. One or more of the CCs may be configured as downlink CCs and one or more of the CCs may be configured as uplink CCs. Also, one of the CCs allocated to the UE115 may be configured as a primary CC (pcc), and the remaining CCs allocated to the UE115 may be configured as secondary CCs (sccs).
Fig. 2 illustrates a plurality of TDD uplink-downlink configurations 200 for a radio frame, in accordance with various aspects of the present disclosure. The TDD uplink-downlink configuration may be used for communication between a base station and a UE (e.g., between base station 105 and UE115 described with reference to fig. 1), and may be used by base stations and UEs operating according to enhanced interference suppression and traffic adaptation (eIMTA) in some examples. Each TDD uplink-downlink configuration may include a plurality of uplink (U) subframes, a plurality of downlink (D) subframes, and a plurality of special (S) subframes. The TDD uplink-downlink configuration may be switched from a D subframe to a U subframe during (or after) an S subframe.
As an example, a TDD uplink-downlink configuration may include seven TDD uplink-downlink configurations (numbers 0-6). The TDD uplink-downlink configurations can include a first set of TDD uplink-downlink configurations (e.g., TDD uplink- downlink configurations 0, 1, 2, and 6) having a first switching period of 5 milliseconds (ms), and a second set of TDD uplink-downlink configurations (e.g., TDD uplink- downlink configurations 3, 4, and 5) having a second switching period of 10 ms. Each TDD uplink-downlink configuration in the first set may include one S subframe per radio frame, and each TDD uplink-downlink configuration in the second set may include two S subframes per radio frame.
Fig. 3 illustrates an example 300 of a coordinated multipoint (CoMP) transmission scheme in accordance with various aspects of the disclosure. Each CoMP transmission scheme may provide communication between one or more base stations and a UE (e.g., between one or more base stations 105 described with reference to fig. 1 and UE115 described with reference to fig. 1). For example, fig. 3 shows a downlink CoMP transmission scheme 310, an uplink CoMP transmission scheme 310-a, and a Coordinated Beamforming (CBF) transmission scheme 310-b. In some examples, a Dynamic Point Selection (DPS) transmission scheme may be used in conjunction with the downlink CoMP transmission scheme 310, the uplink CoMP transmission scheme 310-a, or the CBF transmission scheme 310-b.
Downlink CoMP transmission scheme 310 may enable coordinated transmission (e.g., joint transmission) of data (e.g., the same data) from multiple base stations or enbs (e.g., from first base station 305 and second base station 305-a) to UE 315. The uplink CoMP transmission scheme 310-a may enable coordinated reception (e.g., joint reception) of data (e.g., the same data) transmitted by the UE 315-a at multiple base stations or enbs (e.g., at the third base station 305-b and the fourth base station 305-c). Downlink CoMP and uplink CoMP may be separately or jointly enabled for the UE. The CBF transmission scheme 310-b may enable a base station 305-d to transmit to a UE 315-b using multiple antennas, which may be controlled to form beams that may reduce interference with UEs of neighboring cells. The DPS transmission scheme may be used in conjunction with the downlink CoMP transmission scheme 310, the uplink CoMP transmission scheme 310-a, or the CBF transmission scheme 310-b and may involve changing the cells involved in downlink transmission or uplink transmission from one subframe to another subframe.
The CoMP transmission scheme may be used for homogeneous and/or heterogeneous networks (HetNets). The base station nodes involved in the CoMP transmission scheme may for example use an X2 interface or optical fiber coupling. In the HetNet CoMP transmission scheme, the low power nodes may sometimes be referred to as Remote Radio Heads (RRHs). In some examples, one or more Virtual Cell Identifiers (VCIs) may be configured for Physical Downlink Shared Channel (PDSCH) demodulation reference signals (DM-RSs) to enable more efficient CoMP operations at a UE. For example, the UE may be dynamically indicated which VCI is to be used for PDSCH in the subframe.
In some examples, the cell ID may be managed as follows. For downlink transmissions in the downlink radio frequency spectrum band, the Physical Downlink Control Channel (PDCCH) may be based on a Physical Cell Identifier (PCI). The PDSCH DM-RS may be based on the PCI configured for the UE or one of the two VCIs (where PDSCH data scrambling is PCI based). Enhanced Pdcch (EPDCCH) DM-RS may be PCI or VCI based (where EPDCCH data scrambling is PCI based). For uplink transmissions in the uplink radio frequency spectrum band, the Physical Uplink Shared Channel (PUSCH) DM-RS may be based on the PCI or VCI configured for the UE (where PUSCH data scrambling is PCI based). The same PCI may be used for both downlink and uplink transmissions for the same cell.
For CoMP transmission schemes, dynamic PDSCH rate matching and quasi-co-location (QCL) configuration may be supported. The set of rate matching parameters for each PDSCH transmission may be indicated to the UE via a 2-bit indicator in the Downlink Control Information (DCI). Each rate matching parameter set may be selected from up to four rate matching parameter sets configured for the UE. Dynamic PDSCH rate matching can facilitate operations such as DPS, where transmission of PDSCH can be dynamically handed off from one cell to another. With regard to QCL configuration, a non-zero power channel state information reference signal (CSI-RS) that can be assumed to be quasi co-located with DM-RS and CRS may be indicated to the UE in order to facilitate time and/or frequency tracking and PDSCH demodulation.
In some examples, it may be useful to communicate in FDD mode using a first downlink transmission and a second downlink transmission, where the first downlink transmission is transmitted/received in a first radio frequency spectrum band (e.g., downlink radio frequency spectrum band) of a paired radio frequency spectrum band, and where the second downlink transmission is transmitted/received in a second radio frequency spectrum band (e.g., uplink radio frequency spectrum band) of the paired radio frequency spectrum band. Similar to the TDD uplink-downlink configuration described with reference to fig. 2, the first downlink transmission and the second downlink transmission may adaptively adapt to dynamic traffic changes in the downlink radio frequency spectrum band and the uplink radio frequency spectrum band. The first downlink transmission and the second downlink transmission may include downlink control transmissions and/or downlink data transmissions. The techniques disclosed in this disclosure may be used to manage, for example, cell IDs, QCL configurations, and/or rate matching configurations associated with a first downlink transmission and a second downlink transmission.
A first downlink transmission in a first radio frequency spectrum band (e.g., a downlink radio frequency spectrum band) and a second downlink transmission in a second radio frequency spectrum band (e.g., an uplink radio frequency spectrum band) may be associated with the same or different transmit power limits or interference characteristics. For example, a first downlink transmission in the downlink radio frequency spectrum band may be associated with a maximum transmit power of 46dBm, and a second downlink transmission in the uplink radio frequency spectrum band may be associated with a maximum transmit power of 23dBm (i.e., up to a difference of 23 dBm). Such differences in maximum transmit power may result in the first downlink transmission and the second downlink transmission being associated with different inter-cell interference and/or different cell coverage areas, which may have a significant impact on CoMP operations. However, in examples that include transmissions from small cells, a first downlink transmission in the downlink radio frequency spectrum band may be associated with a maximum transmit power of 30dBm, and a second downlink transmission in the uplink radio frequency spectrum band may be associated with a maximum transmit power of 23dBm (i.e., up to a difference of 7 dBm). This difference in maximum transmit power (for small cells) may not have a significant impact on CoMP operation.
For interference characteristics associated with downlink transmissions in the downlink radio frequency spectrum band and the uplink radio frequency spectrum band, interference to a first downlink transmission in the downlink radio frequency spectrum band may be from downlink transmissions of other cells (e.g., other base stations), but interference to a second downlink transmission in the uplink radio frequency spectrum band may be from downlink transmissions of other cells (e.g., transmissions of other base stations) or uplink transmissions of other cells (e.g., transmissions of other UEs).
Given potential differences (e.g., transmit power limits or interference characteristics) associated with downlink transmissions in a first radio frequency spectrum band (e.g., a downlink radio frequency spectrum band) and a second radio frequency spectrum band (e.g., an uplink radio frequency spectrum band) of a pair of radio frequency spectrum bands, one or more of a cell ID, a QCL configuration, and/or a rate matching configuration associated with the first downlink transmission and the second downlink transmission may be managed (e.g., by a base station and a UE) respectively.
For cell IDs, cell ID management for a UE may include, for example, determining cell IDs for downlink transmissions in a downlink radio frequency spectrum band, downlink transmissions in an uplink radio frequency spectrum band, and uplink transmissions in the uplink radio frequency spectrum band. Although the cell IDs may be determined (or managed) separately, two or more of the cell IDs may include the same cell ID or different cell IDs. In some examples, the first cell ID (e.g., for a first downlink transmission in a downlink radio frequency spectrum band) and the second cell ID (e.g., for a second downlink transmission in an uplink radio frequency spectrum band) may include the same PCI or the same VCI. In some examples, the same VCI may be useful for small cells, where CoMP operations for the first downlink transmission and the second downlink transmission are similar. In some examples, the same PCI may be used for a first downlink transmission in a downlink radio frequency spectrum band, a second downlink transmission in an uplink radio frequency spectrum band, and an uplink transmission in an uplink radio frequency spectrum band (e.g., when a VCI is not configured or used).
For the QCL configuration and the rate-matching configuration, a first QCL configuration and a first rate-matching configuration for a first downlink transmission (in the downlink radio frequency spectrum band) and a second QCL configuration and a second rate-matching configuration for a second downlink transmission (in the uplink radio frequency spectrum band) may be determined by the UE. While the first and second QCL configurations may be determined (or managed), respectively, and the first and second rate-matching configurations may be determined (or managed), respectively, in some examples the second QCL configuration may be determined based on the first QCL configuration, and in some examples the second rate-matching configuration may be determined based on the first rate-matching configuration.
Even when the second QCL configuration is determined based on the first QCL configuration, or the second rate-matching configuration is determined based on the first rate-matching configuration, some parameters of the first QCL configuration and the second QCL configuration may be different, as may the parameters of the first rate-matching configuration and the second rate-matching configuration. For example, for downlink transmissions in the uplink radio frequency spectrum band, there may be non-CRS related rate matching, or there may be CRS related rate matching that is different from CRS related rate matching used for downlink transmissions in the downlink radio frequency spectrum band.
CRS may be provided in only some downlink transmissions in the uplink radio frequency spectrum band for different configurations of CRS-related rate matching. For example, the second rate matching configuration may include at least one of: rate matching related to a second CRS associated with a sparser CRS, or rate matching related to a third CRS associated with a dynamically occurring CRS, as compared to rate matching related to a first CRS associated with a downlink transmission in a downlink radio frequency spectrum band. When CRS is provided in only some downlink transmissions in the uplink radio frequency spectrum band, PDSCH rate matching around CRS provided in a first downlink transmission in the downlink radio frequency spectrum band may be different from PDSCH rate matching around CRS provided in a second downlink transmission in the uplink radio frequency spectrum band.
For downlink transmissions in a downlink radio frequency spectrum band, at least one control symbol period (e.g., OFDM symbol period) may be allocated to the control region, and the PDSCH and EPDCCH may have no modulation symbols mapped to the control region. In some examples, the control region allocated for downlink transmissions in the downlink radio frequency spectrum band may be used to schedule downlink transmissions in the uplink radio frequency spectrum band (e.g., cross-spectrum scheduling may be provided for downlink transmissions in the uplink radio frequency spectrum band). In some examples, the portion of the control region allocated in the downlink transmission in the downlink radio frequency spectrum band may be allocated for scheduling legacy transmissions in the downlink radio frequency spectrum band. In other examples, the portion of the control region allocated for scheduling legacy transmissions may instead be allocated for cross-spectrum scheduling of downlink transmissions in the uplink radio frequency spectrum band (i.e., the same portion of the control region may be used to provide scheduling of legacy transmissions in the downlink radio frequency spectrum band or scheduling of downlink transmissions in the uplink radio frequency spectrum band).
In some examples, the first QCL configuration for the first downlink transmission in the downlink radio frequency spectrum band may include at least one parameter different from a corresponding parameter of the second QCL configuration for the second downlink transmission in the uplink radio frequency spectrum band. For example, the first QCL configuration may include at least one reference signal transmitted/received in a downlink radio frequency spectrum band, and the second QCL configuration may include at least a first reference signal transmitted/received in a downlink radio frequency spectrum band, and at least a second reference signal transmitted/received in an uplink radio frequency spectrum band (e.g., cross-spectrum QCL operation may be provided for the second downlink transmission). In some examples, the first QCL configuration may include CRS, DM-RS, or CSI-RS in a downlink radio frequency spectrum band.
In some examples, the at least first reference signal of the second QCL configuration may include at least one of CRS or CSI-RS, and the at least second reference signal of the second QCL configuration may include at least one of DM-RS or SRS. In the alternative, the at least first reference signal of the second QCL configuration may include at least one of CRS, and the at least second reference signal of the second QCL configuration may include at least one of DM-RS or CSI-RS. In another alternative, the second QCL configuration may include CRS, DM-RS, and CSI-RS in the uplink radio frequency spectrum band, but CRS in the uplink radio frequency spectrum band may be less dense than CRS in the downlink radio frequency spectrum band. In another alternative, at least a first reference signal in the downlink radio frequency spectrum band may include CRS and CSI-RS, and at least a second reference signal in the uplink radio frequency spectrum band may include DM-RS. When CRS is provided for a first downlink transmission in a downlink radio frequency spectrum band and a second downlink transmission in an uplink radio frequency spectrum band, the same cell ID or different cell IDs may be associated with different CRS.
In some examples, a first CSI feedback may be determined for a first downlink transmission in a downlink radio frequency spectrum band and a second CSI feedback may be determined for a second downlink transmission in an uplink radio frequency spectrum band (e.g., the first CSI feedback for the first downlink transmission and the second CSI feedback for the second downlink transmission may be separately managed). In some examples, the first CSI feedback may be based on CSI-RSs in a downlink radio frequency spectrum band, and the second CSI feedback may be based on SRSs in an uplink radio frequency spectrum band. In some examples, the number of antenna ports of the SRS may be increased from four to eight using different cyclic shifts and/or frequency combs.
In some examples, Demodulation Reference Signals (DRSs) may be transmitted/received at least in part in an uplink radio frequency spectrum band for downlink operation. For example, the DRS may include at least a first reference signal transmitted/received in a downlink radio frequency spectrum band and at least a second reference signal transmitted/received in an uplink radio frequency spectrum band. In some examples, the at least first reference signal may include at least one of a Primary Synchronization Signal (PSS) or a Secondary Synchronization Signal (SSS) or a CRS, and the at least second reference signal may include at least one of a CSI-RS or an SRS. In some examples, at least the first reference signal may be associated with a first cell ID and at least the second reference signal may be associated with a second cell ID. The first cell ID and the second cell ID may include the same cell ID or different cell IDs (e.g., cell IDs may be managed separately).
In some cases, PUSCH may support four-layer (4-layer) MIMO operation, with 4-layer DM-RSs distinguished by different cyclic shifts (e.g., cyclic shift values of 0, 3, 6, and 9 for four layers). When downlink transmissions in the uplink radio frequency spectrum band are based on an uplink waveform (e.g., PUSCH), support for eight-layer (8-layer) single-user MIMO (SU-MIMO) operation may be required. In some examples, eight-layer SU-MIMO transmissions may be supported by associating downlink transmissions with at least one of: eight different cyclic shifts in each of a first slot and a second slot of a subframe, a first four different sets of cyclic shifts in the first slot and a second four different sets of cyclic shifts in the second slot, a first four different sets of cyclic shifts in the first frequency comb and a second four different sets of cyclic shifts in the second frequency comb, or a combination thereof.
Fig. 4 illustrates a block diagram 400 of an apparatus 415 for use in wireless communications, in accordance with various aspects of the present disclosure. The apparatus 415 may be an example of aspects of one or more of the UEs 115, 315-a, or 315-b described with reference to fig. 1 or 3. The apparatus 415 may also be or include a processor. The apparatus 415 may include a receiver 410, a wireless communication manager 420, or a transmitter 430. Each of these components may communicate with each other.
The components of the apparatus 415 may be implemented, individually or collectively, using one or more Application Specific Integrated Circuits (ASICs) adapted to perform some or all of the applicable functions in hardware. Alternatively, the functions may be performed by one or more other processing units (or cores), on one or more integrated circuits. In other examples, other types of integrated circuits may be used (e.g., structured/platform ASICs, Field Programmable Gate Arrays (FPGAs), system-on-a-chip (SoC), and/or other types of semi-custom ICs), which may be programmed in any manner known in the art. The functions of each component may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or special purpose processors.
In some examples, the receiver 410 may include at least one radio frequency receiver, such as at least one radio frequency receiver operable to receive transmissions on one or more radio frequency spectrum bands. In some examples, one or more of the radio frequency spectrum bands may be used for wireless communications, e.g., as described with reference to fig. 1, 2, or 3. The receiver 410 may be used to receive various types of data or control signals (i.e., transmissions) over one or more communication links of a wireless communication system, such as one or more communication links of the wireless communication system 100 or 300 described with reference to fig. 1 or 3.
In some examples, the transmitter 430 may include at least one radio frequency transmitter, such as at least one radio frequency transmitter operable to transmit over one or more radio frequency spectrum bands. The transmitter 430 may be used to transmit various types of data or control signals (i.e., transmissions) over one or more communication links of a wireless communication system, such as one or more communication links of the wireless communication system 100 or 300 described with reference to fig. 1 or 3.
In some examples, the wireless communication manager 420 may be used to manage one or more aspects of the wireless communication of the apparatus 415. In some examples, portions of the wireless communication manager 420 may be incorporated into or shared with the receiver 410 or the transmitter 430. In some examples, the wireless communication manager 420 may include a radio frequency spectrum cell ID determiner 435.
The radio frequency spectrum cell ID determiner 435 may be for determining a first cell ID associated with a first downlink transmission in a first radio frequency spectrum band of the pair of radio frequency spectrum bands. The radio frequency spectrum cell ID determiner 435 may also be for determining a second cell ID associated with a second downlink transmission in a second radio frequency spectrum band of the pair of radio frequency spectrum bands. The wireless communication manager 420 may communicate based on the first cell ID and/or the second cell ID.
In some examples of the apparatus 415, the first band of radio frequency spectrum may comprise a downlink band of radio frequency spectrum and the second band of radio frequency spectrum may comprise an uplink band of radio frequency spectrum. In some examples, the first and second radio frequency spectrum bands may be associated with at least one of: different transmit power limits, different interference characteristics, or a combination thereof. Alternatively, the first and second radio frequency spectrum bands may be associated with the same set of power limits and/or the first and second radio frequency spectrum bands may be associated with the same set of interference characteristics. The first cell ID and the second cell ID may include the same cell ID or different cell IDs. In some examples, the first cell ID and the second cell ID may include the same PCI or the same VCI.
Fig. 5 illustrates a block diagram 500 of an apparatus 515 for use in wireless communications in accordance with various aspects of the disclosure. The apparatus 515 may be an example of aspects of one or more of the UEs 115, 315-a, or 315-b described with reference to fig. 1 or 3, or aspects of the apparatus 415 described with reference to fig. 4. The apparatus 515 may also be or include a processor. The apparatus 515 may include a receiver 510, a wireless communication manager 520, or a transmitter 530. Each of these components may communicate with each other.
The components of the apparatus 515 may be implemented, individually or collectively, using one or more ASICs adapted to perform some or all of the applicable functions in hardware. Alternatively, the functions may be performed by one or more other processing units (or cores), on one or more integrated circuits. In other examples, other types of integrated circuits may be used (e.g., structured/platform ASICs, FPGAs, socs, and/or other types of semi-custom ICs), which may be programmed in any manner known in the art. The functions of each component may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or special purpose processors.
In some examples, the receiver 510 may include at least one radio frequency receiver, such as at least one radio frequency receiver operable to receive transmissions on one or more radio frequency spectrum bands. In some examples, one or more of the radio frequency spectrum bands may be used for wireless communications, as described, for example, with reference to fig. 1, 2, or 3. The receiver 510 may be used to receive various types of data or control signals (i.e., transmissions) over one or more communication links of a wireless communication system, such as one or more communication links of the wireless communication system 100 or 300 described with reference to fig. 1 or 3.
In some examples, the transmitter 530 may include at least one radio frequency transmitter, such as at least one radio frequency transmitter operable to transmit over one or more radio frequency spectrum bands. The transmitter 530 may be used to transmit various types of data or control signals (i.e., transmissions) over one or more communication links of a wireless communication system, such as one or more communication links of the wireless communication system 100 or 300 described with reference to fig. 1 or 3.
In some examples, wireless communication manager 520 may be used to manage one or more aspects of wireless communication of apparatus 515. In some examples, portions of the wireless communication manager 520 may be incorporated into or shared with the receiver 510 or the transmitter 530. In some examples, wireless communication manager 520 may include a radio frequency spectrum cell ID determiner 535, a radio frequency spectrum QCL configuration determiner 540, a radio frequency spectrum rate matching configuration determiner 545, a DRS processor 550, a CRS processor 555, a CSI-RS processor 560, a SRS processor 565, or a CSI feedback determiner 570.
The radio frequency spectrum cell ID determiner 535 may be for determining a first cell ID associated with a first downlink transmission in a downlink radio frequency spectrum band of the pair of radio frequency spectrum bands. The radio frequency spectrum cell ID determiner 535 may also be for determining a second cell ID associated with a second downlink transmission in an uplink radio frequency spectrum band of the pair of radio frequency spectrum bands.
In some examples of the apparatus 515, the downlink radio frequency spectrum band and the uplink radio frequency spectrum band may be associated with at least one of: different transmit power limits, different interference characteristics, or a combination thereof. Alternatively, the downlink radio frequency spectrum band and the uplink radio frequency spectrum band may be associated with the same set of power limits and/or the downlink radio frequency spectrum band and the uplink radio frequency spectrum band may be associated with the same set of interference characteristics. The first cell ID and the second cell ID may include the same cell ID or different cell IDs. In some examples, the first cell ID and the second cell ID may include the same PCI or the same VCI.
The radio frequency spectrum QCL configuration determiner 540 may be configured to determine a first QCL configuration for a first downlink transmission or a second QCL configuration for a second downlink transmission. In some examples, the radio frequency spectrum QCL configuration determiner 540 may determine the second QCL configuration based on the first QCL configuration. In some examples, the second QCL configuration may include at least one parameter different from a corresponding at least one parameter of the first QCL configuration. For example, the first QCL configuration may include at least one reference signal transmitted/received in a downlink radio frequency spectrum band, and the second QCL configuration may include at least a first reference signal transmitted/received in a downlink radio frequency spectrum band, and at least a second reference signal transmitted/received in an uplink radio frequency spectrum band. In some examples, the at least first reference signal may include at least one of a CRS or a CSI-RS, and the at least second reference signal may include at least one of a DM-RS or an SRS.
In some examples of apparatus 515, the second QCL configuration may include at least one parameter different from a corresponding at least one parameter of the first QCL configuration. For example, the first QCL configuration may include at least one reference signal transmitted/received in a downlink radio frequency spectrum band, and the second QCL configuration may include at least a first reference signal transmitted/received in a downlink radio frequency spectrum band, and at least a second reference signal transmitted/received in an uplink radio frequency spectrum band. In some examples, the at least first reference signal may include at least one of a CRS or a CSI-RS, and the at least second reference signal may include at least one of a DM-RS or an SRS.
The radio frequency spectrum rate matching configuration determiner 545 may be used to determine a first rate matching configuration for a first downlink transmission or a second rate matching configuration for a second downlink transmission. In some examples, the radio frequency spectrum rate matching configuration determiner 545 may determine the second rate matching configuration based on the first rate matching configuration. In some examples, the second rate matching configuration may include at least one of: non-CRS related rate matching, or second CRS related rate matching associated with a sparser CRS compared to first CRS related rate matching associated with a first rate matching configuration, or third CRS related rate matching associated with a dynamically occurring CRS, or non-control region related rate matching compared to control region related rate matching associated with a first downlink transmission, or a combination thereof.
In some examples, wireless communication manager 520 may be configured to communicate (e.g., with one or more base stations) based on the first and/or second cell IDs, the first and/or second QCL configurations, and/or the first and/or second rate-matching configurations.
DRS processor 550 may be used to receive DRSs. In some examples, the DRS may include at least a first reference signal received in a downlink radio frequency spectrum band and at least a second reference signal received in an uplink radio frequency spectrum band. In some examples, the at least first reference signal may include at least one of a PSS, or a SSS, or a CRS, and the at least second reference signal may include at least one of a CSI-RS or a SRS. In some examples, at least the first reference signal may be associated with a first cell ID and at least the second reference signal may be associated with a second cell ID.
The CRS processor 555 may be used to receive a first CRS associated with a first cell ID in the downlink radio frequency spectrum band and/or a second CRS associated with a second cell ID in the uplink radio frequency spectrum band. In some examples, the first CRS and the second CRS may be received as part of the first DRS and the second DRS, respectively.
The CSI-RS processor 560 may be configured to receive CSI-RS in a downlink radio frequency spectrum band. In some examples, the CSI-RS may be associated with a first cell ID. In some examples, the CSI-RS may be received as part of a first DRS. An SRS processor 565 can be configured to receive SRS in the uplink radio frequency spectrum band. In some examples, the SRS may be associated with the second cell ID. In some examples, the SRS may be received as part of the second DRS.
The CSI feedback determiner 570 may be configured to determine a first CSI feedback for a first downlink transmission or a second CSI feedback for a second downlink transmission. In some examples, the first CSI feedback may be based on CSI-RS received by CSI-RS processor 560 and the second CSI feedback may be based on SRS received by SRS processor 565.
Fig. 6 illustrates a block diagram 600 of an apparatus 615 for use in wireless communications, in accordance with various aspects of the present disclosure. The apparatus 615 may be an example of aspects of one or more of the UEs 115, 315-a, or 315-b described with reference to fig. 1 or 3. The device 615 may also be or include a processor. The apparatus 615 may include a receiver 610, a wireless communication manager 620, or a transmitter 630. Each of these components may communicate with each other.
The components of the apparatus 615 may be implemented, individually or collectively, using one or more ASICs adapted to perform some or all of the applicable functions in hardware. Alternatively, the functions may be performed by one or more other processing units (or cores), on one or more integrated circuits. In other examples, other types of integrated circuits may be used (e.g., structured/platform ASICs, FPGAs, socs, and/or other types of semi-custom ICs), which may be programmed in any manner known in the art. The functions of each component may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or special purpose processors.
In some examples, receiver 610 may include at least one radio frequency receiver, such as at least one radio frequency receiver operable to receive transmissions on one or more radio frequency spectrum bands. In some examples, one or more of the radio frequency spectrum bands may be used for wireless communications, as described, for example, with reference to fig. 1, 2, or 3. The receiver 610 may be used to receive various types of data or control signals (i.e., transmissions) over one or more communication links of a wireless communication system, such as one or more communication links of the wireless communication system 100 or 300 described with reference to fig. 1 or 3.
In some examples, the transmitter 630 may include at least one radio frequency transmitter, such as at least one radio frequency transmitter operable to transmit over one or more radio frequency spectrum bands. The transmitter 630 may be used to transmit various types of data or control signals (i.e., transmissions) over one or more communication links of a wireless communication system, such as one or more communication links of the wireless communication system 100 or 300 described with reference to fig. 1 or 3.
In some examples, the wireless communication manager 620 may be used to manage one or more aspects of the wireless communication of the apparatus 615. In some examples, a portion of the wireless communication manager 620 may be incorporated into or shared with the receiver 610 or the transmitter 630. In some examples, the wireless communication manager 620 may include a radio frequency spectrum cell ID determiner 635 or a downlink transmission manager 640.
The radio frequency spectrum cell ID determiner 635 may be configured to determine a cell ID associated with a downlink transmission in an uplink radio frequency spectrum band. The downlink transmission manager 640 may be configured to receive downlink transmissions in subframes of an uplink radio frequency spectrum band. The downlink transmission may be based on the format of the cell ID and PUSCH and may include eight-layer SU-MIMO transmission. In some examples, the downlink transmission may be associated with at least one of: eight different cyclic shifts in each of the first and second slots of the subframe, a first four different sets of cyclic shifts in the first slot and a second four different sets of cyclic shifts in the second slot, a first four different sets of cyclic shifts in the first frequency comb and a second four different sets of cyclic shifts in the second frequency comb, or a combination thereof.
Fig. 7 illustrates a block diagram 700 of a UE715 for use in wireless communications, in accordance with various aspects of the present disclosure. The UE715 may be included in or be part of a personal computer (e.g., laptop, netbook, tablet, etc.), a cellular telephone, a PDA, DVR, internet appliance, game console, e-reader, etc. In some examples, the UE715 may have an internal power source (not shown), such as a small battery, to facilitate mobile operation. In some examples, the UE715 may be an example of aspects of one or more of the UEs 115, 315-a, or 315-b described with reference to fig. 1 or 3, or aspects of the apparatus 415, 515, or 615 described with reference to fig. 4, 5, or 6. The UE715 may be configured to implement at least some of the UE or device techniques and functions described with reference to fig. 1, 2, 3, 4, 5, or 6.
The UE715 may include a UE processor 710, a UE memory 720, at least one UE transceiver (represented by UE transceiver 730), at least one UE antenna (represented by UE antenna 740), or a UE wireless communications manager 750. Each of these components may communicate with each other, directly or indirectly, over one or more buses 735.
The UE memory 720 may include Random Access Memory (RAM) or Read Only Memory (ROM). The UE memory 720 may store computer-readable, computer-executable code 725 containing instructions configured to, when executed, cause the UE processor 710 to perform various functions described herein relating to wireless communications, including: for example, based on a first cell ID associated with a first downlink transmission in a first radio frequency spectrum band (e.g., downlink radio frequency spectrum band) of the pair of radio frequency spectrum bands and a second cell ID associated with a second downlink transmission in a second radio frequency spectrum band (e.g., uplink radio frequency spectrum band) of the pair of radio frequency spectrum bands. Alternatively, the computer-executable code 725 may not be directly executable by the UE processor 710, but rather configured to cause the UE715 (e.g., when compiled and executed) to perform various functions described herein.
The UE processor 710 may include intelligent hardware devices such as a Central Processing Unit (CPU), microcontroller, ASIC, etc. The UE processor 710 may process information received through the UE transceiver 730 or information to be sent to the UE transceiver 730 for transmission through the UE antenna 740. The UE processor 710 may, alone or in conjunction with the UE wireless communications manager 750, handle various aspects of communicating over (or managing communication over) one or more radio frequency spectrum bands.
The UE transceiver 730 may include a modem configured to modulate packets and provide the modulated packets to the UE antenna 740 for transmission, and demodulate packets received from the UE antenna 740. In some examples, UE transceiver 730 may be implemented as one or more UE transmitters and one or more separate UE receivers. UE transceiver 730 may support communication in one or more radio frequency spectrum bands. The UE transceiver 730 may be configured to communicate bi-directionally via the UE antenna 740 with one or more of the base stations 105, 305-a, 305-b, 305-c, or 305-d described with reference to fig. 1 or 3. Although the UE715 may include a single UE antenna, there may be examples where the UE715 may include multiple UE antennas (e.g., UE antenna 740).
The UE wireless communications manager 750 may be configured to perform or control some or all of the UE or device technologies or functions related to wireless communications described with reference to fig. 1, 2, 3, 4, 5, or 6. The UE wireless communication manager 750, or a portion thereof, may include a processor, or some or all of the functionality of the UE wireless communication manager 750 may be performed by the UE processor 710 or in conjunction with the UE processor 710. In some examples, the UE wireless communication manager 750 may be an example of the wireless communication manager 420, 520, or 620 described with reference to fig. 4, 5, or 6.
Fig. 8 is a flow diagram illustrating an example of a method 800 for wireless communication in accordance with various aspects of the present disclosure. For clarity, the method 800 is described below with reference to aspects of one or more of the UEs 115, 315-a, 315-b, or 715 described with reference to fig. 1, 3, or 7, or aspects of one or more of the apparatuses 415 or 515 described with reference to fig. 4 or 5. In some examples, the UE may execute one or more sets of codes to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below.
At block 805, the method 800 may include determining a first cell ID associated with a first downlink transmission in a first radio frequency spectrum band of a pair of radio frequency spectrum bands. The operations at block 805 may be performed using the wireless communication manager 420 or 520 or the UE wireless communication manager 750 described with reference to fig. 4, 5, or 7, or the radio frequency spectrum cell ID determiner 435 or 535 described with reference to fig. 4 or 5.
At block 810, the method 800 may include determining a second cell ID associated with a second downlink transmission in a second radio frequency spectrum band of the pair of radio frequency spectrum bands. The operations at block 810 may be performed in parallel with the operations at block 805 (as shown), or before or after the operations at block 805 (not shown). The operations at block 810 may be performed using the wireless communication manager 420 or 520 or the UE wireless communication manager 750 described with reference to fig. 4, 5, or 7, or the radio frequency spectrum cell ID determiner 435 or 535 described with reference to fig. 4 or 5.
At block 815, method 800 may include communicating (e.g., with one or more base stations) based on the first cell ID and/or the second cell ID. The operations at block 815 may be performed using the wireless communication manager 420 or 520 or the UE wireless communication manager 750 described with reference to fig. 4, 5, or 7.
In some examples of method 800, the first band of radio frequency spectrum may comprise a downlink band of radio frequency spectrum and the second band of radio frequency spectrum may comprise an uplink band of radio frequency spectrum. In some examples, the first and second radio frequency spectrum bands may be associated with at least one of: different transmit power limits, different interference characteristics, or a combination thereof. Alternatively, the first and second radio frequency spectrum bands may be associated with the same set of power limits and/or the first and second radio frequency spectrum bands may be associated with the same set of interference characteristics. The first cell ID and the second cell ID may include the same cell ID or different cell IDs. In some examples, the first cell ID and the second cell ID may include the same PCI or the same VCI.
Thus, the method 800 may provide wireless communication. It should be noted that the method 800 is just one implementation and that the operations of the method 800 may be rearranged or otherwise modified such that other implementations are possible.
Fig. 9 is a flow diagram illustrating an example of a method 900 for wireless communication in accordance with various aspects of the disclosure. For clarity, the method 900 is described below with reference to aspects of one or more of the UEs 115, 315-a, 315-b, or 715 described with reference to fig. 1, 3, or 7, or aspects of one or more of the apparatuses 415 or 515 described with reference to fig. 4 or 5. In some examples, the UE may execute one or more sets of codes to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below. In some examples, operations of the first flow including blocks 905, 910, 915, 925, 930, or 935 may be performed in parallel with operations of the second flow including blocks 940, 945, 950, 955, 960, or 965. In some examples, the operations of the first and second flows may not be performed in parallel (not shown).
At block 905, method 900 may include determining a first cell ID associated with a first downlink transmission in a downlink radio frequency spectrum band of a pair of radio frequency spectrum bands. The operations at block 905 may be performed using the wireless communication manager 420 or 520 or the UE wireless communication manager 750 described with reference to fig. 4, 5, or 7, or the radio frequency spectrum cell ID determiner 435 or 535 described with reference to fig. 4 or 5.
At block 940, method 900 may include determining a second cell ID associated with a second downlink transmission in an uplink radio frequency spectrum band of the pair of radio frequency spectrum bands. Operations at block 940 may be performed using the wireless communication manager 420 or 520 or the UE wireless communication manager 750 described with reference to fig. 4, 5, or 7, or the radio frequency spectrum cell ID determiner 435 or 535 described with reference to fig. 4 or 5.
In some examples, the downlink radio frequency spectrum band and the uplink radio frequency spectrum band may be associated with at least one of: different transmit power limits, different interference characteristics, or a combination thereof. Alternatively, the downlink radio frequency spectrum band and the uplink radio frequency spectrum band may be associated with the same set of power limits and/or the downlink radio frequency spectrum band and the uplink radio frequency spectrum band may be associated with the same set of interference characteristics. The first cell ID and the second cell ID may include the same cell ID or different cell IDs. In some examples, the first cell ID and the second cell ID may include the same PCI or the same VCI.
At block 910, method 900 may include determining a first QCL configuration for a first downlink transmission. The operations at block 910 may be performed using the wireless communication manager 420 or 520 or the UE wireless communication manager 750 described with reference to fig. 4, 5, or 7, or the radio frequency spectrum, QCL, configuration determiner 540 described with reference to fig. 5.
At block 945, method 900 may include determining a second QCL configuration for a second downlink transmission. In some examples, operations at block 945 may include determining a second QCL configuration based on the first QCL configuration. Operations at block 945 may be performed using the wireless communication manager 420 or 520 or the UE wireless communication manager 750 described with reference to fig. 4, 5, or 7, or the radio frequency spectrum, QCL, configuration determiner 540 described with reference to fig. 5.
In some examples of method 900, the second QCL configuration may include at least one parameter different from a corresponding at least one parameter of the first QCL configuration. For example, the first QCL configuration may include at least one reference signal transmitted/received in a downlink radio frequency spectrum band, and the second QCL configuration may include at least a first reference signal transmitted/received in a downlink radio frequency spectrum band, and at least a second reference signal transmitted/received in an uplink radio frequency spectrum band. In some examples, the at least first reference signal may include at least one of a CRS or a CSI-RS, and the at least second reference signal may include at least one of a DM-RS or an SRS.
At block 915, method 900 may include determining a first rate matching configuration for a first downlink transmission. The operations at block 915 may be performed using the wireless communication manager 420 or 520 or the UE wireless communication manager 750 described with reference to fig. 4, 5, or 7, or the radio frequency spectrum rate matching configuration determiner 545 described with reference to fig. 5.
At block 950, method 900 may include determining a second rate matching configuration for a second downlink transmission. In some examples, operations at block 950 may include determining a second rate-matching configuration based on the first rate-matching configuration. The operations at block 950 may be performed using the wireless communication manager 420 or 520 or the UE wireless communication manager 750 described with reference to fig. 4, 5, or 7, or the radio frequency spectrum rate matching configuration determiner 545 described with reference to fig. 5.
In some examples of method 900, the second rate matching configuration may include at least one of: non-CRS related rate matching, or second CRS related rate matching associated with a sparser CRS compared to first CRS related rate matching associated with a first rate matching configuration, or third CRS related rate matching associated with a dynamically occurring CRS, or non-control region related rate matching compared to control region related rate matching associated with a first downlink transmission, or a combination thereof.
At one or more of blocks 920, 925, 930, 955, or 960, method 900 may include communicating (e.g., with one or more base stations) based on the first and/or second cell IDs, the first and/or second QCL configurations, and/or the first and/or second rate-matching configurations.
At block 920, method 900 may include receiving a DRS. In some examples, the DRS may include at least a first reference signal received in a downlink radio frequency spectrum band and at least a second reference signal received in an uplink radio frequency spectrum band. In some examples, the at least first reference signal may include at least one of a PSS, SSS, or CRS, and the at least second reference signal may include at least one of a CSI-RS or SRS. In some examples, at least the first reference signal may be associated with a first cell ID and at least the second reference signal may be associated with a second cell ID. Operations at block 920 may be performed using wireless communication manager 420 or 520 or UE wireless communication manager 750 described with reference to fig. 4, 5, or 7, or DRS processor 550 described with reference to fig. 5.
At block 925, method 900 may include receiving a first CRS associated with a first cell ID in a downlink radio frequency spectrum band. At block 955, the method 900 may include receiving a second CRS associated with a second cell ID in an uplink radio frequency spectrum band. In some examples, the first CRS and the CRS may be received as part of the first DRS or the second DRS, respectively. The operations at block 925 or 955 may be performed using the wireless communication manager 420 or 520 or the UE wireless communication manager 750 described with reference to fig. 4, 5, or 7, or the CRS processor 555 described with reference to fig. 5.
At block 930, method 900 may include receiving CSI-RS in a downlink radio frequency spectrum band. In some examples, the CSI-RS may be associated with a first cell ID. At block 960, method 900 may include receiving an SRS in an uplink radio frequency spectrum band. In some examples, the SRS may be associated with the second cell ID. In some examples, the CSI-RS or SRS may be received as part of the first DRS or the second DRS, respectively. The operations at blocks 930 or 960 may be performed using the wireless communication manager 420 or 520 or the UE wireless communication manager 750 described with reference to fig. 4, 5, or 7, or the CSI-RS processor 560 or the SRS processor 565 described with reference to fig. 5.
At block 935, method 900 may include determining first CSI feedback for the first downlink transmission. At block 965, method 900 may include determining second CSI feedback for the second downlink transmission. In some examples, the first CSI feedback may be based on the CSI-RS received at block 930 and the second CSI feedback may be based on the SRS received at block 960. Operations at blocks 935 or 965 may be performed using the wireless communication manager 420 or 520 or the UE wireless communication manager 750 described with reference to fig. 4, 5, or 7, or the CSI feedback determiner 570 described with reference to fig. 5.
Thus, the method 900 may provide wireless communication. It should be noted that the method 900 is just one implementation and that the operations of the method 900 may be rearranged or otherwise modified such that other implementations are possible.
Fig. 10 is a flow diagram illustrating an example of a method 1000 for wireless communication in accordance with various aspects of the present disclosure. For clarity, the method 1000 is described below with reference to aspects of one or more of the UEs 115, 315-a, 315-b, or 715 described with reference to fig. 1, 3, or 7, or aspects of the apparatus 615 described with reference to fig. 6. In some examples, the UE may execute one or more sets of codes to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below.
At block 1005, method 1000 may include determining a cell ID associated with a downlink transmission in an uplink radio frequency spectrum band. Operations at block 1005 may be performed using the wireless communication manager 620 or the UE wireless communication manager 750 described with reference to fig. 6 or 7, or the radio frequency spectrum cell ID determiner 635 described with reference to fig. 6.
At block 1010, the method 1000 may include receiving a downlink transmission in a subframe of an uplink radio frequency spectrum band. The downlink transmission may be based on the format of the cell ID and PUSCH and may include eight-layer SU-MIMO transmission. In some examples, the downlink transmission may be associated with at least one of: eight different cyclic shifts in each of the first and second slots of the subframe, a first four different sets of cyclic shifts in the first slot and a second four different sets of cyclic shifts in the second slot, a first four different sets of cyclic shifts in the first frequency comb and a second four different sets of cyclic shifts in the second frequency comb, or a combination thereof. The operations at block 1010 may be performed using the wireless communication manager 620 or the UE wireless communication manager 750 described with reference to fig. 6 or 7, or the downlink transmission manager 640 described with reference to fig. 6.
Thus, the method 1000 may provide wireless communication. It should be noted that the method 1000 is just one implementation and that the operations of the method 1000 may be rearranged or otherwise modified such that other implementations are possible.
In some examples, aspects from two or more of the methods 800, 900, or 1000 described with reference to fig. 8, 9, or 10 may be combined. It should be noted that the method 800, 900 or 1000 is merely an exemplary embodiment and the operations of the method 800, 900 or 1000 may be rearranged or otherwise modified such that other embodiments are possible.
The techniques described herein may be used for various wireless communication systems such as CDMA, TDMA, FDMA, OFDMA, Single-Carrier FDMA (SC-FDMA) and other systems. The terms "system" and "network" are often used interchangeably. A CDMA network may implement a radio technology such as CDMA2000, Universal Terrestrial Radio Access (UTRA), and the like. CDMA2000 covers IS-2000, IS-95 and IS-856 standards. IS-2000 releases 0 and A may be referred to generally as CDMA 20001X, 1X, etc. IS-856(TIA-856) may be commonly referred to as CDMA 20001 xEV-DO, High Rate Packet Data (HRPD), or the like. UTRA includes wideband CDMA (wcdma) and other variants of CDMA. TDMA systems may implement wireless technologies such as global system for mobile communications (GSM). OFDMA systems may implement methods such as Ultra Mobile Broadband (UMB), evolved UTRA (E-UTRA), IEEE 802.11(Wi-Fi), IEEE 802.16(WiMAX), IEEE 802.20, Flash-OFDMTMEtc. wireless technologies. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). 3GPP LTE and LTE-A are releases of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE-A and GSM are described in the literature of an organization named 3 GPP. CDMA2000 and UMB are described in a document entitled "third generation partnership project 2" (3GPP 2). The techniques described herein may be used for the above-mentioned systems and wireless technologies as well as other systems and wireless technologies, including cellular (e.g., LTE) communication over unlicensed or shared bandwidth. However, the above description describes an LTE/LTE-a system for purposes of example, and LTE terminology is used in much of the description above, although the techniques are applicable beyond LTE/LTE-a applications.
The detailed description set forth above in connection with the appended drawings describes examples, but does not represent all examples that may be practiced or within the scope of the claims. The terms "example" and "exemplary" used in this description mean "serving as an example, instance, or illustration," and not "preferred" or "superior to other examples. The detailed description includes specific details for the purpose of providing an understanding of the described technology. However, these techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the examples.
Information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed with a general purpose processor, a Digital Signal Processor (DSP), an ASIC, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and embodiments are within the scope and spirit of the present disclosure and appended claims. For example, due to the nature of software, the functions described above can be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these. Features implementing functions may also be physically located in multiple locations, including portions distributed such that functions are implemented in different physical locations. As used herein, including in the claims, the term "and/or" when used in a list of two or more items means that any one of the listed items can be used by itself, or any combination of two or more of the listed items can be used. For example, if a composition is described as containing components A, B and/or C, the composition may comprise a alone a; b alone; c alone; a and B in combination; a and C in combination; b and C in combination; or A, B in combination with C. Further, as used herein, including in the claims, "or" as used in a list of items (e.g., a list of items prefaced by a phrase such as "at least one of …" or "one or more of …") indicates an inclusive list such that, for example, a phrase referring to "at least one of a list of items refers to any combination of those items, including single members. By way of example, "A, B or at least one of C" is intended to cover A, B, C, A-B, A-C, B-C and a-B-C, as well as any combination of the same elements with multiple (e.g., any other ordering of a-A, A-a-A, A-a-B, A-a-C, A-B-B, A-C-C, B-B, B-B-B, B-B-C, C-C and C-C, or A, B and C).
As used herein, the phrase "based on" should not be construed as a reference to a closed condition set. For example, an exemplary step described as "based on condition a" may be based on condition a and condition B without departing from the scope of the present disclosure. That is, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based on, at least in part, the" base.
Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, non-transitory computer-readable media can comprise RAM, ROM, electrically erasable programmable read-only memory (EEPROM), Compact Disc (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, includes CD, laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (28)

1. A method for wireless communication at a User Equipment (UE), comprising:
determining a first cell Identifier (ID) associated with a first downlink transmission in a first radio frequency spectrum band of a pair of radio frequency spectrum bands, the first radio frequency spectrum band comprising a downlink radio frequency spectrum band;
determining a second cell ID associated with a second downlink transmission in a second radio frequency spectrum band of the pair of radio frequency spectrum bands, the second radio frequency spectrum band comprising an uplink radio frequency spectrum band; and
communicate based at least in part on the first cell ID and the second cell ID,
wherein the first and second radio frequency spectrum bands are associated with at least one of: different transmit power limits, or different interference characteristics, or a combination thereof.
2. The method of claim 1, further comprising:
determining a second quasi-co-location (QCL) configuration for the second downlink transmission.
3. The method of claim 2, further comprising:
determining a first QCL configuration for the first downlink transmission;
wherein the second QCL configuration is determined based at least in part on the first QCL configuration.
4. The method of claim 2, wherein the second QCL configuration comprises at least a first reference signal received in the downlink radio frequency spectrum band and at least a second reference signal received in the uplink radio frequency spectrum band.
5. The method of claim 4, in which the at least first reference signal comprises at least one of a cell-specific reference signal (CRS) or a channel state information reference signal (CSI-RS), and the at least second reference signal comprises at least one of a demodulation reference signal (DM-RS) or a Sounding Reference Signal (SRS).
6. The method of claim 1, further comprising:
determining a second rate matching configuration for the second downlink transmission.
7. The method of claim 6, further comprising:
determining a first rate matching configuration for the first downlink transmission;
wherein the second rate matching configuration is determined based at least in part on the first rate matching configuration.
8. The method of claim 6, wherein the second rate matching configuration comprises at least one of: non-CRS related rate matching, or second CRS related rate matching associated with a sparser CRS compared to first CRS related rate matching associated with the first downlink transmission, or third CRS related rate matching associated with a dynamically occurring CRS, or non-control region related rate matching compared to control region related rate matching associated with the first downlink transmission, or a combination thereof.
9. The method of claim 1, in which the first cell ID is different from the second cell ID, and in which the communicating comprises:
receiving a first CRS associated with the first cell ID in the downlink radio frequency spectrum band; and
receiving a second CRS associated with the second cell ID in the uplink radio frequency spectrum band.
10. The method of claim 1, in which the first cell ID and the second cell ID comprise a same cell ID, and in which the communicating comprises:
receiving a first CRS associated with the first cell ID in the downlink radio frequency spectrum band; and
receiving a second CRS associated with the second cell ID in the uplink radio frequency spectrum band.
11. The method of claim 1, further comprising:
determining first Channel State Information (CSI) feedback for the first downlink transmission; and
determining second CSI feedback for the second downlink transmission.
12. The method of claim 11, further comprising:
receiving a CSI-RS in the downlink radio frequency spectrum band; and
receiving a Sounding Reference Signal (SRS) in the uplink radio frequency spectrum band;
wherein the first CSI feedback is based at least in part on the CSI-RS, and the second CSI feedback is based at least in part on the SRS.
13. The method of claim 1, wherein the communicating comprises:
the DRS is received.
14. The method of claim 13, wherein the DRS includes at least a first reference signal received in the downlink radio frequency spectrum band and at least a second reference signal received in the uplink radio frequency spectrum band.
15. The method of claim 14, wherein the at least first reference signal comprises at least one of a Primary Synchronization Signal (PSS), or a Secondary Synchronization Signal (SSS), or a CRS, and wherein the at least second reference signal comprises at least one of a CSI-RS or a SRS.
16. The method of claim 1, wherein the first and second radio frequency spectrum bands are associated with at least one of: different transmit power limits, or different interference characteristics, or a combination thereof.
17. The method of claim 1, in which the first cell ID and the second cell ID comprise a same Physical Cell ID (PCI) or a same Virtual Cell ID (VCI).
18. The method of claim 1, wherein the communicating comprises:
receiving the second downlink transmission in a subframe of the second radio frequency spectrum band, the second downlink transmission based at least in part on the second cell ID and a format of a Physical Uplink Shared Channel (PUSCH), and the second downlink transmission comprising an eight layer single user multiple input multiple output (SU-MIMO) transmission.
19. The method of claim 18, wherein the second downlink transmission is associated with at least one of: eight different cyclic shifts in each of a first slot and a second slot of the subframe, or a first four different sets of cyclic shifts in the first slot and a second four different sets of cyclic shifts in the second slot, or the first four different sets of cyclic shifts in a first frequency comb and the second four different sets of cyclic shifts in a second frequency comb, or a combination thereof.
20. An apparatus for wireless communication at a User Equipment (UE), comprising:
means for determining a first cell Identifier (ID) associated with a first downlink transmission in a first radio frequency spectrum band of a pair of radio frequency spectrum bands, the first radio frequency spectrum band comprising a downlink radio frequency spectrum band;
means for determining a second cell ID associated with a second downlink transmission in a second radio frequency spectrum band of the pair of radio frequency spectrum bands, the second radio frequency spectrum band comprising an uplink radio frequency spectrum band; and
means for communicating based at least in part on the first cell ID and the second cell ID,
wherein the first and second radio frequency spectrum bands are associated with at least one of: different transmit power limits, or different interference characteristics, or a combination thereof.
21. The apparatus of claim 20, further comprising:
means for determining a second quasi-co-location (QCL) configuration for the second downlink transmission.
22. The apparatus of claim 21, further comprising:
means for determining a first QCL configuration for the first downlink transmission;
wherein the second QCL configuration is determined based at least in part on the first QCL configuration.
23. The apparatus of claim 21, wherein the second QCL configuration comprises at least a first reference signal received in the downlink radio frequency spectrum band and at least a second reference signal received in the uplink radio frequency spectrum band.
24. The apparatus of claim 23, wherein the at least first reference signal comprises at least one of a cell-specific reference signal (CRS) or a channel state information reference signal (CSI-RS), and the at least second reference signal comprises at least one of a demodulation reference signal (DM-RS) or a Sounding Reference Signal (SRS).
25. The apparatus of claim 20, further comprising:
means for determining a second rate matching configuration for the second downlink transmission.
26. The apparatus of claim 25, further comprising:
means for determining a first rate matching configuration for the first downlink transmission;
wherein the second rate matching configuration is determined based at least in part on the first rate matching configuration.
27. An apparatus for wireless communication at a User Equipment (UE), comprising:
a processor;
a memory coupled to the processor; and
the processor and the memory are configured to:
determining a first cell Identifier (ID) associated with a first downlink transmission in a first radio frequency spectrum band of a pair of radio frequency spectrum bands, the first radio frequency spectrum band comprising a downlink radio frequency spectrum band;
determining a second cell ID associated with a second downlink transmission in a second radio frequency spectrum band of the pair of radio frequency spectrum bands, the second radio frequency spectrum band comprising an uplink radio frequency spectrum band; and
communicate based at least in part on the first cell ID and the second cell ID,
wherein the first and second radio frequency spectrum bands are associated with at least one of: different transmit power limits, or different interference characteristics, or a combination thereof.
28. A non-transitory computer-readable medium storing computer-executable code for wireless communication, the code executable by a processor to:
determining a first cell Identifier (ID) associated with a first downlink transmission in a first radio frequency spectrum band of a pair of radio frequency spectrum bands, the first radio frequency spectrum band comprising a downlink radio frequency spectrum band;
determining a second cell ID associated with a second downlink transmission in a second radio frequency spectrum band of the pair of radio frequency spectrum bands, the second radio frequency spectrum band comprising an uplink radio frequency spectrum band; and
communicate based at least in part on the first cell ID and the second cell ID,
wherein the first and second radio frequency spectrum bands are associated with at least one of: different transmit power limits, or different interference characteristics, or a combination thereof.
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